Drinking mug



FIG. 1 is a front elevational view of a drinking mug showing my new design.

FIG. 2 is a rear elevational view thereof.

FIG. 3 is a left side elevational view thereof.

FIG. 4 is a right side elevational view thereof.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines are provided for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a drinking mug, as shown and described. 